Most things included upon items are games, but this is not always the case. In the case of compilations, or electronic magazines, an item (i.e. a physical cartridge or other type of media)
may contain demos, pictures, articles and all sorts of other things. At database level, the things have not only specific ids (i.e. thing_id), they also have a thing_type_id which corresponds
to the 'type' of thing they are. For example, type 1 is a game, type 2 is a utility, type 3 is a demo ... etc.

This command merely tells you which thing_type_id corresponds to which type of thing. At time of writing, it returns the following response:

You can use the thing_type_id with calls such as getAllThingIDs to narrow down the thing_ids returned. This process is throughly described in the documentation for that call.

Whilst the above should satisfy most needs, there is an additional, optional parameter called [thing_type_id]. This is a filter and including it will narrow down the subset of data which the call returns. This [thing_type_id] is an integer and must take one of the following values: